The decision to go to grad school or not can be tricky, with tuition really expensive and skyrocketing each year, yet postgraduate degrees earning, on average, 23% to 55% more than bachelor degrees. This calculator from LearnVest can help you decide.

The calculator takes into consideration your current salary and expected salary increases, grad school costs and loan rates, and expected salary after you graduate. It then gives you a simple comparison: How much you'll make in your lifetime (after-tax earnings) without grad school versus with grad school and what your minimum monthly loan payments will be like. If your total is a positive number, going to grad school will benefit you overall financially based on those criteria. If not, you may want to reconsider.

The calculator is nice for its simple, clear answer at the end, but if you want a more detailed breakdown, Kiplinger's payoff calculator is another good one to use that adds a few other variables. Kiplinger's calculator compares your current salary to your postgraduate degree salary by year, so you can really see the difference your degree will make.